More sofas, compact and again shaped like organic elements, though now in various colors, offer seating in the hall of the office tower, where the Y-shaped element on the ceiling that accompanies visitors in the pathway of access from the subway is multiplied, generating a new, suspended pattern of reference. Most of the surfaces of walls and ceilings are involved in the application of custom parts in GRG, which thanks to its content of natural quartzite and gypsum and the possibilities of recycling in a perspective of circular economics acts as a versatile material, one of the main ingredients of the sustainable design. Stopa also emphasizes that “this is an important social aspect of the project: the effort to create an interior design under the guise of functional art, offered for everyday use to those who work in the offices of the Warsaw HUB, and all the visitors.”